battery problem. really low voltage 20.4v

Need to know how to take of bike? Look no further, just don't ask me, I'm bloody useless ;)
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paddycork
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Joined: Thu Jul 11, 2019 6:47 pm

Thu Jul 11, 2019 6:55 pm

hello, i just bought a second hand carerra crossfire e bike. it didnt have the charger, the guy couldnt find it so i have just bought a new one from cycle republic https://www.cyclerepublic.com/chg-vp-e- ... arger.html

Before charging the voltage was readig around 31v. i plugged in charger and it was charging away and i checked the voltage periodically ( i think it was 39.5 last time i checked) and it was rising. just before going to bed i plugged it out and checked the voltage again and it was 20.4v,

I have just taken it apart today and tested the batteries and they are all reading 4v in their series connections.. any ideas cause im stuck and frustrated!

thanks

paddy


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Daz-The Bionic Cyclist
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Thu Jul 11, 2019 8:48 pm

Are you still having trouble getting this bike running Paddy?

I don't understand, the battery pack can't be 31v before charging and 20v after unless the charger is discharging.
Are all the batteries connected correctly, an undervoltage might be a bad connection?

Have you checked the individul cells, they should be charged to 4.2ish volts. You might also have some dead cells.
Is it possible a fuse blew to only half the pack?
It's definately strange after a positive charge that you get a sudden drop.

You could ask this guy:
https://the-bionic-cyclist.co.uk/2019/0 ... placement/


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Daz-The Bionic Cyclist
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Fri Jul 12, 2019 1:05 pm

Hmm. Reading your post again this morning and I can't help but wonder why the pack reached 39v. It's a 36v pack, and 39v is too high. This could have damaged the pack.


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Daz-The Bionic Cyclist
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Sat Jul 13, 2019 1:48 pm

My old but fully charged pack is showing 41.4V

My new pack with a 27% charge is 35.4V

The charger is a solid 40.4V - no load, and I think it's nigh on impossible to test with a load, I imagine it won't change much though, possibly only a few extra volts, as it's already 4V above the packs full charge of 36V
Crossfire-E battery charger<br />joycube SSLC084v42XH
Crossfire-E battery charger
joycube SSLC084v42XH
EXIF-Data show/hide
Original image recording time:
2019:07:13 13:37:10
Image taken on:
Sat Jul 13, 2019 12:37 pm
Focus length:
4.25 mm
Shutter speed:
1/34 Sec
F-number:
f/1.8
ISO speed rating:
400
Whitebalance:
Auto
Flash:
Flash did not fire, auto mode
Camera-manufacturer:
Apple
Camera-model:
IPhone XS
Exposure program:
Normal program
Exposure bias:
0 EV
Metering mode:
Spot
The only thing I can think of now Paddy is that your battery pack has died :sad:


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You exchange your time for money when you work. You can always make more money. You cannot make more time.
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